What do you think you have for R-value there? You might need to add more insulation. Other than that, I'd try to block the holes in the brick so there is no breeze going through there (but leave it vented). Fiberglass is known to let drafts through it. The vapor barrier will help that too.
Its gonna be hard to get the floor (low, cold air) warm, especially when its hanging over something even colder.
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